Optical device



FIG. 1 is a perspective view of an optical device showing my new design;

FIG. 2 is another perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a left side elevation view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The dash broken lines shown in the figures represent portions of the optical device that form no part of the claimed design. The dash dot dash broken lines shown in the figures represents boundaries to the claimed design and forms no part of the claimed design. 

CLAIM The ornamental design for an optical device, as shown and described. 